16 hours ago
The Zwirbelturm translated to Spiralling Tower also known as the Mulleroide named after Eric Muller who invented the figure in 1974 with the Acrostar.
Definitely my all time favorite figure to fly. It's fairly gentle on the pilot but looks really spectacular from the cockpit and ground.
This is a direct quote from Eric Muller on how to fly the Zwirbelturm:
"With a high entry speed, you start by executing a vertical roll to the right, and then slowly add negative flick inputs - pushed right stick and left rudder. First the aircraft changes its pitch axis to a less vertical attitude and then it begins to flick. To further flatten the attitude you must flatten the negative flick or flatten the negative "ascending spin" which follows. To do this you give left aileron, which should have the desired effect of flattening the longitudinal axis even more, while the aircraft still rotates. In this moment the precession of the motor is not a great help, because it either stops the rotation or lifts your nose: so the secret is to gently close the throttle progressively during the flick. At the moment when you are rotating at the highest point of the figure and the aircraft starts its decent, you must open the throttle again to keep the nose high because at this moment it wants to drop. You move the stick from the forward left pushed position to aft right aileron position. Your aircraft will then descend in a positive flat spin until you give the recovery actions, which are (simultaneously) throttle closed, right rudder, pulled elevator and inside aileron.
Control inputs and finesse will differ slightly from aircraft to aircraft."
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